Data processing during a mobile handover operation

ABSTRACT

A data processing method is provided for forwarding data in the case of handover between heterogeneous networks. The data processing method includes: when a user equipment (UE) is handed over from an originating network to a receiving network, receiving, by the originating network, a data forwarding address obtained by the receiving network; creating a data forwarding tunnel between an originating network gateway and a receiving network gateway according to the data forwarding address; and forwarding data to the receiving network through the data forwarding tunnel. A data processing device is also provided. The lossless data processing solution can overcome the problem of data loss in the case of handover between heterogeneous networks in the existing technology, reduces the time of user service interruption and enhances the user experience.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/CN2008/072555, filed on Sep. 26, 2008, which claims priorities toChinese Patent Application No. 200710166088.4, filed on Nov. 2, 2007 andChinese Patent Application No. 200810212916.8, filed on Sep. 5, 2008,all of which are hereby incorporated by reference in their entireties.

FIELD OF THE INVENTION

The present invention relates to a network technology, and inparticular, to a data processing method and device.

BACKGROUND OF THE INVENTION

To enhance the competitiveness of networks in the future, the 3rdGeneration Partnership Project (3GPP) is studying a brand-new evolvednetwork. As shown in FIG. 1, the system architecture of the evolvednetwork includes: an evolved UMTS terrestrial radio access network(E-UTRAN), adapted to implement the radio access functions in theevolved network; a mobility management entity (MME), responsible formobility management of the control plane, such as user context andmobile status management and allocation of temporary user IDs; a servinggateway (serving GW), which is the user plane anchor point between the3GPP access networks and also the interface for receiving the E-TURAN;and a packet data network gateway (PDN GW), which is the user planeanchor point between a 3GPP access network and a non-3GPP access networkand also the interface for receiving the connection with external PDNs.A policy and charging rules function (PCRF) is adapted to make a policycontrol decision and exercise traffic charging control. A homesubscriber server (HSS) is adapted to store subscription information ofusers.

A UMTS terrestrial radio access network (UTRAN) and a GSM/EDGE radioaccess network (GERAN) are adapted to implement the radio accessfunctions in the current GPRS/UMTS network. A serving GPRS support node(SGSN) is adapted to implement functions in the GPRS/UMTS network, suchas routing and forwarding, mobility management, session management, anduser information storage.

Non-3GPP IP access networks are defined by some non-3GPP organizations.Such networks include a wireless local area network (WLAN), a worldwideinteroperability for microwave access (WIMAX) network, and a codedivision multiple access (CDMA) network. The non-3GPP IP access networksare connected to a PDN GW and an authentication, authorization andaccounting (AAA) server, where the AAA server is adapted to implementaccess authentication, authorization and accounting functions for a userequipment (UE).

FIG. 2 shows an architecture of a system for optimizing handover betweena 3GPP network and a high rate packet data (HRPD) network (a CDMAnetwork). An S101 interface is added between an MME and an HRPD accessnetwork (HRPD AN) for transmitting signaling messages between the MMEand the HRPD AN. A packet data serving node (PDSN) is a user planeprocessing network element (NE) in the HRPD network, and is adapted toperform user plane processing in the HRPD network.

In the existing technology, a scenario where a UE is handed over betweenheterogeneous networks may occur. For example, the UE in the HRPD accessnetwork is handed over to an E-UTRAN access network.

During the implementation of the present invention, the inventordiscovers the following problem in the existing technology: The processof handover between heterogeneous networks in the existing technology,for example, handover between the HRPD network and the E-UTRAN network,does not consider the data lossless processing method, causing a largeamount of data loss during the handover process. As a result, the userservice is interrupted for a long time and even the user service iscompletely interrupted, which affects user experiences.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a data processing methodand device to implement lossless data transmission during the process ofhandover between heterogeneous networks.

To achieve the above objective, an embodiment of the present inventionprovides a data processing method. The method includes:

when a user equipment (UE) is handed over from an originating network toa receiving network, receiving, by the originating network, a dataforwarding address obtained by the receiving network;

creating a data forwarding tunnel between an originating network gatewayand a receiving network gateway according to the data forwardingaddress; and

forwarding data to the receiving network through the data forwardingtunnel.

Another embodiment of the present invention provides a data processingmethod. The method includes:

when a UE is handed over from an originating network to a receivingnetwork, notifying, by a receiving network gateway, a user plane anchorpoint NE of the receiving network and the originating network ofbi-casting; and

sending, by the user plane anchor point NE, data to the originatingnetwork and the receiving network at the same time according to thenotification.

An embodiment of the present invention provides a data processing deviceof a receiving network. The data processing device includes:

a handover originating entity, adapted to: notify a receiving networkgateway of creating data forwarding resources when detecting that a UEis handed over to the receiving network, receive a data forwardingaddress sent from the receiving network gateway, and send the forwardingaddress to an originating network; and

the receiving network gateway, adapted to: receive the notification fromthe handover originating entity, create data forwarding resources, andsend the data forwarding address to the handover originating entity.

An embodiment of the present invention provides a data processing deviceof an originating network. The data processing device includes:

a handover processing entity, adapted to: obtain a data forwardingaddress that a receiving network obtains when a UE is handed over to thereceiving network, and send the data forwarding address to anoriginating network gateway; and

the originating network gateway, adapted to: create a data forwardingtunnel with a receiving network gateway according to the data forwardingaddress, and send data to the receiving network through the dataforwarding tunnel.

Another embodiment of the present invention provides a data processingdevice of a receiving network. The data processing device includes:

a handover originating entity, adapted to notify a receiving networkgateway of bi-casting when detecting that a UE is handed over from anoriginating network to the receiving network; and

the receiving network gateway, adapted to: receive the notificationmessage, send the notification message to a user plane anchor point NEof the receiving network and the originating network, and receive datasent from the user plane anchor point NE.

Compared with the existing technology, embodiments of the presentinvention have the following merits:

Embodiments of the present invention provide a data processing methodapplicable to the process of handover between heterogeneous networks.Through data forwarding or simultaneous data transmission on theoriginating network and the receiving network, the data processingmethod overcomes the problem of data loss during the process of handoverbetween heterogeneous networks in the existing technology, reduces theduration of user service interruption and enhances the user experience.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an architecture of an evolved network;

FIG. 2 shows a structure of a system for optimizing handover between a3GPP network and an HRPD network in a CDMA network;

FIG. 3 is a flowchart of a data processing method provided in a firstembodiment of the present invention;

FIG. 4 is a flowchart of another data processing method provided in thefirst embodiment of the present invention;

FIG. 5A shows a process of handover from an HRPD network to an E-UTRANthrough a data forwarding method provided in a second embodiment of thepresent invention;

FIG. 5B shows a signaling process of handover from an HRPD network to anE-UTRAN through the data forwarding method provided in the secondembodiment of the present invention;

FIG. 6A shows a process of handover from an E-UTRAN to an HRPD networkthrough the data forwarding method provided in the second embodiment ofthe present invention;

FIG. 6B shows a signaling process of handover from an E-UTRAN to an HRPDnetwork through the data forwarding method provided in the secondembodiment of the present invention;

FIG. 7A shows a process of handover from an HRPD network to an E-UTRANthrough a bi-casting method provided in a third embodiment of thepresent invention;

FIG. 7B shows a signaling process of handover from an HRPD network to anE-UTRAN through the bi-casting method provided in the third embodimentof the present invention;

FIG. 8A shows a process of handover from an E-UTRAN to an HRPD networkthrough the bi-casting method provided in the third embodiment of thepresent invention;

FIG. 8B shows a signaling process of handover from an E-UTRAN to an HRPDnetwork through the bi-casting method provided in the third embodimentof the present invention;

FIG. 9 shows a data processing system provided in a fourth embodiment ofthe present invention; and

FIG. 10 shows a data processing system provided in a fifth embodiment ofthe present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiments of the present invention are hereinafter described in detailwith reference to the accompanying drawings and exemplary embodiments.

A data processing method provided in the first embodiment of the presentinvention is used for data forwarding in the case of handover betweenheterogeneous networks. The method may implement lossless dataforwarding during the network handover by establishing a data forwardingtunnel between an originating network and a receiving network where theUE is handed over or sending data at the same time (bi-casting) in theoriginating network and the receiving network. The heterogeneousnetworks include a 3GPP network and a non-3GPP network or includehybrid-networked non-3GPP networks, for example, hybrid-networked CDMAnetwork and WIMAX network.

As shown in FIG. 3, when using the method of establishing a dataforwarding tunnel, a data processing method provided in the firstembodiment of the present invention includes the following steps:

S301: When the UE is handed over from the originating network to thereceiving network, the receiving network gateway creates a dataforwarding address.

S302: The receiving network sends the forwarding address to theoriginating network.

S303: The originating network creates a data forwarding tunnel betweenthe gateways of the originating network and receiving network accordingto the received forwarding address.

S304: The originating network forwards the data to the receiving networkthrough the data forwarding tunnel.

For the data forwarding in the case of handover between heterogeneousnetworks with a single access point name (APN) and multiple PDNconnections, S302 is as follows: The receiving network sends the dataforwarding address and PDN connection information to the originatingnetwork.

The PDN connection information may include one of the following aspects:

(1) PDN connection ID. The PDN connection ID is used to identify eachPDN connection of the UE.

(2) APN and PDN connection ID. The APN and PDN connection ID are used toidentify each PDN connection of the UE.

(3) APN+sequence number. The APN and sequence number are used toidentify each PDN connection of the UE. For example, the first PDNconnection of the UE is identified by APN:1; the second PDN connectionof the UE is identified by APN:2; and the rest can be inferred in thesame manner.

S303 is as follows: The originating network creates a data forwardingtunnel between the gateways of the originating network and receivingnetwork according to the received data forwarding address and PDNconnection information.

As shown in FIG. 4, when using the bi-casting method, a data processingmethod provided in an embodiment of the present invention includes thefollowing steps:

S401: When the UE is handed over from the originating network to thereceiving network, the receiving network gateway notifies a user planeanchor point NE of the receiving network and the originating network.

S402: The receiving network gateway receives data that the user planeanchor point NE sends to the originating network and the receivingnetwork.

Supposing the UE is handed over between an HRPD network and an E-UTRAN,the following describes embodiments of the present invention withreference to specific scenarios.

The process of handover from an HRPD network to an E-UTRAN through adata forwarding method is described in the second embodiment of thepresent invention. Herein, when the receiving network is an E-UTRAN andthe originating network is an HRPD network, the first NE of thereceiving network is an MME and the second NE of the receiving networkis an S-GW, while the first NE of the originating network is an HRPD ANand the second NE of the originating network is a PDSN. As shown in FIG.5A, the process includes the following steps:

S5A01: After discovering that the UE is handed over from the HRPDnetwork to the E-UTRAN, the MME notifies the serving GW of creating dataforwarding resources between the HRPD network and the E-UTRAN (includinga data forwarding tunnel between the serving GW and the PDSN, and a dataforwarding tunnel between the serving GW and an eNodeB).

S5A02: The serving GW establishes tunnel and notifies the MME of thetunnel information.

S5A03: The MME notifies the HRPD AN of the serving GW address.

S5A04: The HRPD AN notifies the PDSN of the serving GW address.

S5A05: The PDSN creates data forwarding resources (P-P interface tunnel)between the PDSN and the serving GW according to the serving GW address,and sends downlink data to the serving GW through the interface tunnel.

For the data forwarding in the case of handover between heterogeneousnetworks with a single APN and multiple PDN connections, S5A03 is asfollows: The MME notifies the HRPD AN of the serving GW address and PDNconnection information.

S5A04 is as follows: The HRPD AN notifies the PDSN of the serving GWaddress and PDN connection information.

S5A05 is as follows: The PDSN creates data forwarding resources (P-Pinterface tunnel) between the PDSN and the serving GW according to theserving GW address and PDN connection information. That is, for each PDNconnection, the PDSN creates a generic routing encapsulation (GRE)tunnel between the PDSN and the serving GW; the PDSN forwards downlinkdata in the PDN connection to the serving GW through the GRE tunnel.

The handover signaling process associated with the preceding process inthe networking scenario is shown in FIG. 5B, and includes the followingsteps:

S501: The UE accesses the HRPD network.

S502: The UE or HRPD AN determines to perform handover from the HRPDnetwork to the E-UTRAN.

S503: The UE sends an Attach Request message to the MME through the HRPDnetwork.

S504: Authentication is performed.

S505: The MME sends an Update Location message to the HSS, and obtainsthe subscription data of the UE. The HSS returns the subscription datato the UE, where the subscription data includes address information ofthe PDN GW used by the UE.

S506: The MME selects a serving GW, and sends a Create Default BearerRequest message to the serving GW. The serving GW returns a CreateDefault Bearer Response message to the MME.

S507: If the MME discovers that the UE is handed over from the HRPDnetwork to the E-UTRAN, the MME chooses the serving GW that the UE isusing or selects a serving GW that can forward data between the E-UTRANand the HRPD network. Then, the MME notifies the selected serving GW ofcreating data forwarding resources between the HRPD network and theE-UTRAN. This may be performed as follows:

1. The MME sends a Create Bearer Request message to the serving GW. TheMME adds an indication information element to the message to notify theserving GW of creating data forwarding resources between the HRPDnetwork and the E-UTRAN. The indication information element may include:

HRPD to E-UTRAN handover indication.

Handover type: The MME sets this information element to “HRPD to E-UTRANHandover”.

Data forwarding type: The MME sets this information element to “HRPD toE-UTRAN Data Forwarding”.

Cause: The MME sets this information element to “HRPD to E-UTRANHandover”.

2. The MME sends a specific message, for example, Create Data ForwardingTunnel Request, to notify the serving GW of creating data forwardingresources between the HRPD network and the E-UTRAN.

After receiving the message, the serving GW creates data forwardingresources between the serving GW and the PDSN (P-P interface tunnel) andbetween the serving GW and the eNodeB (GTP-U tunnel). Then, the servingGW returns a Create Bearer Response (serving GW address) message to theMME. The serving GW address is the data forwarding address of theserving GW, and the PDSN forwards downlink packets to a serving GWassociated with the serving GW address.

The serving GW may start a timer, and release created data forwardingresources after the timer times out.

S508: The MME sends an S101 HO Command message to the HRPD AN, where themessage includes an Attach Accept message, an HO Command message, and aserving GW address.

S509: If the HRPD AN discovers that the UE is handed over from the HRPDnetwork to the E-UTRAN, the HRPD AN notifies the PDSN of creating dataforwarding resources between the HRPD and the E-UTRAN. This may beperformed as follows:

1. The HRPD AN sends an A11-Registration Request message to the PDSN.The HRPD AN adds an indication information element to the message tonotify the PDSN of creating data forwarding resources between the HRPDnetwork and the E-UTRAN. The indication information element may include:

HRPD to E-UTRAN handover indication.

Handover type: The HRPD sets this information element to “HRPD toE-UTRAN Handover”.

Data forwarding type: The HRPD AN sets this information element to “HRPDto E-UTRAN Data Forwarding”.

Cause: The HRPD AN sets this information element to “HRPD to E-UTRANHandover”.

The HRPD AN sets an “S” flag bit in the Flag information element to“True” or “1” to notify the PDSN that the cause is “PDSN fast handoff”.

2. The HRPD AN sends a specific message, for example, A11-Create DataForwarding Tunnel Request, to notify the PDSN of creating dataforwarding resources between the HRPD network and the E-UTRAN.

The notification message sent by the HRPD AN carries the serving GWaddress that the HRPD AN receives from the MME. After receiving themessage, the PDSN creates data forwarding resources (P-P connection(PDSN address, serving GW address)) between the PDSN and the serving GW.The PDSN returns an A11-Registration Reply message to the HRPD AN. Theserving GW may start a timer, and release created P-P connectionresources after the timer times out.

After receiving downlink data from the PDN GW, the PDSN forwards thedownlink packets to the serving GW through the established P-Pconnection. For the PDSN, the P-P interface uses a GRE protocol; theinterface between the serving GW and the eNodeB uses a GPRS tunnelingprotocol. The forwarded packets that the serving GW receives from thePDSN are in GRE format. Thus, the serving GW needs to convert theformats of the forwarded packets from GRE into GTP. If no resources areavailable in the eNodeB, the serving GW caches the converted forwardedpackets. If resources are already available in the eNodeB, the servingGW sends the converted forwarded packets to the eNodeB.

S510: The HRPD AN sends an HRPD AN L2 message to the UE, where themessage includes an Attach Accept message and an HO Command message.

S511: The UE is handed over to the E-UTRAN, and sends a Service Requestmessage to the MME.

S512: Authentication may be performed.

S513: The MME sends an S1-AP:Initial Context Setup Request message tothe eNodeB.

S514: The eNodeB initiates a radio bearer (RB) setup process.

S515: The eNodeB returns an S1-AP:Initial Context Setup Complete messageto the MME.

S516: The MME sends an Update Bearer Request message to the serving GW.

S517: If the interface between the serving GW and the PDN GW uses theGTP protocol, the serving GW sends an Update Bearer Request message tothe PDN GW, and the PDN GW returns an Update Bearer Response message tothe serving GW. If the interface between the serving GW and the PDN GWuses a Proxy Mobile IP (PMIP) protocol, the serving GW sends a Proxy BUmessage to the PDN GW, and the PDN GW returns a Proxy BA message to theserving GW.

S518: The Serving GW returns an Update Bearer Response message to theMME.

S519: The MME sends an HO Complete message to the HRPD AN to notify theHRPD AN of the completion of the handover.

S520: The PDN GW initiates a release process at the source HRPD network.

S521: After receiving the HO Complete message, the MME may initiate a“Delete Bearer Request” process to notify the serving GW of deletingcreated forwarding tunnel resources.

For the data forwarding in the case of handover between heterogeneousnetworks with a single APN and multiple PDN connections, S508 is asfollows: The MME sends an S101 HO Command message to the HRPD AN, wherethe message includes an Attach Accept message, an HO Command message, aserving GW address, and PDN connection information.

S509 is as follows: If the HRPD AN discovers that the UE is handed overfrom the HRPD network to the E-UTRAN, that is, if the HRPD AN receivesthe HO Command message from the MME, the HRPD AN notifies the PDSN ofcreating data forwarding resources between the HRPD network and theE-UTRAN. The notification message sent by the HRPD AN carries theserving GW address and PDN connection information that the HRPD ANreceives from the MME. After receiving the preceding notification, thePDSN creates data forwarding resources between the PDSN and the servingGW. That is, for each PDN connection, the PDSN creates a GRE tunnelbetween the PDSN and the serving GW.

The process of handover from an E-UTRAN to an HRPD network through adata forwarding method is also described in the second embodiment of thepresent invention. Herein, when the receiving network is an HRPD networkand the originating network is an E-UTRAN, the first NE of the receivingnetwork is an HRPD AN and the second NE of the receiving network is aPDSN, while the first NE of the originating network is an MME and thesecond NE of the originating network is an S-GW. As shown in FIG. 6A,the process includes the following steps:

S6A01: After discovering that the UE is handed over from the E-UTRAN tothe HRPD network, an HRPD AN sends a message to a PDSN.

S6A02: The HRPD AN receives a forwarding address (also called an anchorP-P address) from the PDSN.

S6A03: The HRPD AN notifies an MME of the forwarding address of thePDSN.

S6A04: The MME sends a message to notify the serving GW of creating dataforwarding resources between the HRPD network and the E-UTRAN (includinga data forwarding tunnel between the serving GW and the PDSN and a dataforwarding tunnel between the serving GW and the eNodeB).

S6A05: The serving GW notifies the MME of the tunnel information.

S6A06: The MME notifies the eNodeB of data forwarding tunnel informationof the serving GW.

S6A07: The eNodeB forwards cached packets to the serving GW.

S6A08: The serving GW forwards the packets the PDSN.

Note: For the data forwarding in the case of handover betweenheterogeneous networks with a single APN and multiple PDN connections,S6A03 is as follows: The HRPD AN notifies the MME of the forwardingaddress of the PDSN and PDN connection information.

The handover signaling process associated with the preceding process inthe networking scenario is shown in FIG. 6B, and includes the followingsteps:

S601: The UE accesses the E-UTRAN.

S602: The UE or eNodeB determines to pre-register with the HRPD network.

S603: The UE executes a particular program in the HRPD AN to establishan IP service connection with the PDSN and perform authentication in theHRPD AN.

S604: The UE or eNodeB determines to perform handover from the E-UTRANto the HRPD network.

S605: The eNodeB sends a Relocation Indication message to the UE tonotify the UE of handover.

S606: The UE sends an HRPD Connection Request message to the HRPD AN.The HRPD AN allocates radio resources, and activates the PDSN session.

S607: If the HRPD AN discovers that the UE is handed over from theE-UTRAN to the HRPD network, the HRPD AN notifies the PDSN of creatingdata forwarding resources between the HRPD network and the E-UTRAN. Thismay be performed as follows:

1. The HRPD AN sends an A11-Registration Request message to the PDSN.The HRPD AN adds an indication information element to the message tonotify the PDSN of creating data forwarding resources between the HRPDnetwork and the E-UTRAN. The indication information element may include:

E-UTRANH to HRPD handover indication.

Handover type: The HRPD AN sets this information element to “E-UTRAN toHRPD Handover”.

Data forwarding type: The HRPD AN sets this information element to“E-UTRAN to HRPD Data Forwarding”.

Cause: The HRPD AN sets this information element to “E-UTRAN to HRPDHandover”.

The HRPD AN sets an “S” flag bit in the Flag information element to“True” or “1” to notify the PDSN that the cause is “PDSN fast handoff”.

2. The HRPD AN sends a specific message, for example, A11-Create DataForwarding Tunnel Request, to notify the PDSN of creating dataforwarding resources between the HRPD network and the E-UTRAN.

After receiving the preceding notification, the PDSN may return anA11-Registration Reply message or an A11-Create Data Forwarding TunnelResponse to the HRPD AN. The message returned by the PDSN carries thedata forwarding address (also called an anchor P-P address) of the PDSN.

S608: The HRPD AN sends an S101 HO Command (HRPD TCA) message to theMME, where the message carries the data forwarding address of the PDSN.

S609: If the MME discovers that the UE is handed over from the E-UTRANto the HRPD network, the MME chooses the serving GW that the UE is usingor selects a serving GW that can forward data between the E-UTRAN andthe HRPD network. Then, the MME notifies the selected serving GW ofcreating data forwarding resources between the HRPD network and theE-UTRAN. This may be performed as follows:

1. The MME sends a Create Bearer Request message to the serving GW. TheMME adds an indication information element to this message to notify theserving GW of creating data forwarding resources between the HRPDnetwork and the E-UTRAN. The indication information element may include:

E-UTRAN to HRPD handover indication.

Handover type: The MME sets this information element to “E-UTRAN to HRPDHandover”.

Data forwarding type: The MME sets this information element to “E-UTRANto HRPD Data Forwarding”.

Cause: The MME sets this information element to “E-UTRAN to HRPDHandover”.

2. The MME sends a specific message, for example, Create Data ForwardingTunnel Request, to notify the serving GW of creating data forwardingresources between the HRPD network and the E-UTRAN.

The message sent by the MME to the serving GW carries a data forwardingaddress of the PDSN. Subsequently, the serving GW forwards the receivedpackets to a PDSN associated with the data forwarding address of thePDSN.

After receiving the preceding message, the serving GW creates dataforwarding resources between the HRPD network and the E-UTRAN (dataforwarding resources between the serving GW and the PDSN and between theserving GW and the eNodeB). Then, the serving GW returns a Create BearerResponse or Create Data Forwarding Tunnel Response message (serving GWaddress and serving GW TEID) to the MME. The serving GW address and theserving GW TEID are data forwarding tunnel information allocated by theserving GW. The eNodeB forwards the cached downlink packets to theallocated data forwarding tunnel.

The serving GW may start a timer, and release established dataforwarding tunnel resources after the timer times out.

S610: The MME sends an S1-AP message “Relocation Command” (includingHRPD TCA, serving GW Address, and serving GW TEID) to the eNodeB.

S611: After receiving this message, the eNodeB sends an HO Commandmessage to the UE to notify the UE of handover, where the messagecarries an HRPD TCA message.

The eNodeB forwards its cached downlink packets to the serving GW. Afterreceiving the downlink packets forwarded by the eNodeB, the serving GWforwards the downlink packets to the PDSN through the established P-Pconnection. For the serving GW, the P-P interface uses the GRE protocol;the interface between the serving GW and the eNodeB uses the GTPprotocol. The forwarded packets that the serving GW receives from theeNodeB are in GTP format. Thus, the serving GW needs to convert theformats of the forwarded packets from GTP into GRE.

S612: The UE is handed over to the HRPD access network, and executes atraffic channel acquisition program.

S613: The UE sends an HRPD Traffic Channel Complete (TCC) message to theHRPD AN.

S614: The HRPD AN notifies the PDSN UE of handover to a target network.The PDSN needs to notify the PDN GW of updating the downlink data route.This may be performed as follows:

1. The HRPD AN sends an A11-Registration Request message to the PDSN.The HRPD AN adds an indication information element to notify the PDSN UEof successful handover to the target network. The PDSN needs to notifythe PDN GW of updating the downlink data path. The indicationinformation element may include:

Handover complete indication.

Handover type: The HRPD AN sets this information element to “HandoverComplete”.

Cause: The HRPD AN sets this information element to “Handover Complete”.

The HRPD AN sets an “S” flag bit of the Flag information element in theA11-Registration Request message to “False” or “0”.

2. The HRPD AN sends a specific message, for example, A11-HandoverComplete, to notify the PDSN UE of successful handover to the targetnetwork. The PDSN needs to notify the PDN GW of updating the downlinkdata path.

S615: After receiving the preceding notification, the PDSN sends a ProxyBU message to the PDN GW.

S616: The PDSN returns an A11-Registration Reply or A11-HandoverComplete Acknowledge message to the HRPD AN.

S617: The source E-UTRAN or EPS releases resources.

S618: The MME may initiate a “Delete Bearer Request” process to notifythe serving GW of deleting the created forwarding tunnel resources.

For the data forwarding in the case of handover between heterogeneousnetworks with a single APN and multiple PDN connections, S608 is asfollows: The HRPD AN sends an S101 HO Command message (HRPD TCA) to theMME, where the message carries the data forwarding address of the PDSNand PDN connection information.

S609: If the MME discovers that the UE is handed over from the E-UTRANto the HRPD network, the MME chooses the serving GW that the UE is usingor selects a serving GW that can forward data between the E-UTRAN andthe HRPD network. Then, the MME notifies the selected serving GW ofcreating data forwarding resources between the HRPD network and theE-UTRAN. The notification message sent by the MME to the serving GWcarries the data forwarding address of the PDSN and PDN connectioninformation. Subsequently, the serving GW forwards the received packetsto a PDSN associated with the data forwarding address of the PDSN.

After receiving the preceding message, the serving GW creates dataforwarding resources between the HRPD network and the E-UTRAN (dataforwarding resources between the serving GW and the PDSN and between theserving GW and the eNodeB). For each PDN connection, the serving GWcreates a GRE tunnel between the serving GW and the PDSN. Subsequently,the serving GW forwards the received packets in this PDN connection tothe PDSN through the GRE tunnel.

The process of handover from an HRPD network to an E-UTRAN through abi-casting method is described in the third embodiment of the presentinvention. Herein, the receiving network is an E-UTRAN; the originatingnetwork is an HRPD network; the first NE of the receiving network is anMME; the second NE of the receiving network is an S-GW; and the userplane anchor point NE is a PDN GW. As shown in FIG. 7A, the processincludes the following steps:

S7A01: After discovering that the UE is handed over from the HRPDnetwork to the E-UTRAN, the MME sends a message to notify the PDN GW ofbi-binding.

S7A02: The PDN GW is bound with the serving GW and the PDSN.

S7A03: After receiving downlink data, the PDN GW bi-casts the downlinkdata to the serving GW and PDSN.

S7A04: After the UE is handed over to the E-UTRAN, the MME notifies thePDN GW of canceling the bi-binding.

S7A05: After receiving the downlink data, the PDN GW sends the receiveddownlink data to the serving GW only.

The handover signaling process associated with the preceding process inthe network scenario is shown in FIG. 7B, and includes the followingsteps:

S701: The UE accesses the HRPD network.

S702: The UE or the HRPD AN determines to perform handover from the HRPDnetwork to the E-UTRAN.

S703: The UE sends an Attach Request message to the MME through the HRPDnetwork.

S704: Authentication is performed.

S705: The MME sends an Update Location message to the HSS to obtain thesubscription data of the UE. The HSS returns the subscription data ofthe UE, including address information of the PDN GW used by the UE.

S706: The MME selects a serving GW, and sends a Create Default BearerRequest message to the serving GW. The MME adds an indicationinformation element to the Create Default Bearer Request message tonotify the serving GW of the cause of the request message or notifysubsequent NEs of how to process the request message. The indicationinformation element may include:

HRPD to E-UTRAN handover indication or 3GPP to non-3GPP handoverindication.

Handover type: The MME sets this information element to “HRPD to E-UTRANHandover” or “non-3GPP to 3GPP Handover”.

Cause: The MME sets this information element to “HRPD to E-UTRANHandover” or “non-3GPP to 3GPP Handover”.

Bi-casting indication: The MME notifies subsequent NEs of the need toperform bi-casting through this information element.

S707: If the interface between the serving GW and the PDN GW uses theGTP protocol, the serving GW sends a Create Default Bearer Requestmessage to the PDN GW. The serving GW adds an indication informationelement to the Create Default Bearer Request message to notify the PDNGW of the cause of the request message or how to process the requestmessage. The indication information element may include:

HRPD to E-UTRAN handover indication or non-3GPP to 3GPP handoverindication.

Handover type: The serving GW sets this information element to “HRPD toE-UTRAN Handover” or “non-3GPP to 3GPP Handover”.

Cause: The serving GW sets this information element to “HRPD to E-UTRANHandover” or “non-3GPP to 3GPP Handover”.

Bi-casting indication: The serving GW notifies the PDN GW of the need toperform bi-casting through this information element.

If the interface between the serving GW and the PDN GW uses the PMIPprotocol, the serving GW sends a Proxy BU message to the PDN GW. Theserving GW adds an indication information element to the Proxy BUmessage to notify the PDN GW of the cause of the BU message or how toprocess the BU message. The indication information element may include:

HRPD to E-UTRAN handover indication or non-3GPP to 3GPP handoverindication.

Handover type: The serving GW sets this information element to “HRPD toE-UTRAN Handover” or “non-3GPP to 3GPP Handover”.

Cause: The serving GW sets this information element to “HRPD to E-UTRANHandover” or “non-3GPP to 3GPP Handover”.

Bi-casting indication: The serving GW notifies the PDN GW of the need toperform bi-casting through this information element.

The serving GW sets an “S” flag bit in the Proxy BU message to notifythe PDN GW of bi-binding.

After receiving the message from the serving GW, the PDN GW adds a BU ora bearer context and retains the resources in the source HRPD. Afterreceiving downlink data, the PDN GW bi-casts the received downlink datain the source HRPD network and target E-UTRAN. The PDN GW may start atimer, and cancel the bi-casting mechanism and release the resources inthe source HRPD network after the timer times out.

S708: The serving GW returns a Create Default Bearer Response message tothe MME.

S709: The MME sends an S101 HO Command message to the HRPD AN, where themessage includes an Attach Accept message and an HO Command message.

S7010: The HRPD AN sends an HRPD AN L2 message to the UE, where themessage includes an Attach Accept message and an HO Command message.

S711: The UE is handed over to the E-UTRAN, and sends a Service Requestmessage to the MME.

S712: Authentication may be performed.

S713: The MME sends an S1-AP: Initial Context Setup Request to theeNodeB.

S714: The eNodeB initiates a RB setup process.

S715: The eNodeB returns an S1-AP: Initial Context Setup Completemessage to the MME.

S716: The MME sends an Update Bearer Request message to the serving GW.The MME may add an indication information element to this message tonotify the serving GW of the cause of this message or how to processthis message. The indication information element may include:

Handover complete indication.

Handover type: The MME sets this information element to “HandoverComplete”.

Update type: The MME sets this information element to “User Plane PathSwitch” or “Cancel Bi-casting”.

Cause: The MME sets this information element to “Handover Complete”,“User Plane Path Switch” or “Cancel Bi-casting”.

Cancel bi-casting indication: The MME notifies subsequent NEs ofcanceling the bi-casting through this information element.

Through the preceding indication information element, the MME notifiesthe serving GW that the bearer update request is caused by the handoverof the UE to the target network or notifies the serving GW of the needto switch the user plane path. This flag bit is optional.

S707: If the interface between the serving GW and the PDN GW uses theGTP protocol, the serving GW sends an Update Bearer Request message tothe PDN GW. The serving GW may add an indication information element tothis message to notify the PDN GW of the cause of this message or how toprocess this message. The indication information element may include:

Handover complete indication.

Handover type: The serving GW sets this information element to “HandoverComplete”.

Update type: The serving GW sets this information element to “User PlanePath Switch” or “Cancel Bi-casting”.

Cause: The serving GW sets this information element to “HandoverComplete”, “User Plane Path Switch” or “Cancel Bi-casting”.

Cancel bi-casting indication: The serving GW notifies the PDN GW ofcanceling the bi-casting through this information element.

Through the preceding indication information element, the serving GWnotifies the PDN GW that the bearer update request is caused by thehandover of the UE to the target network or notifies the PDN GW of theneed to switch the user plane path. This flag bit is optional.

If the interface between the serving GW and the PDN GW uses the PMIPprotocol, the serving GW sends a Proxy BU message to the PDN GW. Theserving GW may add an indication information element to this message tonotify the PDN GW of the cause of this message or how to process thismessage. The indication information element may include:

Handover complete indication.

Handover type: The serving GW sets this information element to “HandoverComplete”.

Update type: The serving GW sets this information element to “User PlanePath Switch” or “Cancel Bi-casting”.

Cause: The serving GW sets this information element to “HandoverComplete”, “User Plane Path Switch” or “Cancel Bi-casting”.

Cancel bi-casting indication: The serving GW notifies the PDN GW ofcanceling the bi-casting through this information element.

The serving GW clears the “S” flag bit in the Proxy BU message to notifythe PDN GW of canceling the binding of the source network.

Through the preceding indication information element, the serving GWnotifies the PDN GW that the BU message is caused by the handover of theUE to the target network or notifies the PDN GW of the need to switchthe user plane path. This flag bit is optional.

After receiving the preceding message, the PDN GW cancels the databi-casting mechanism and routes the downlink data to the serving GW.After receiving the downlink data, the PDN GW sends the receiveddownlink data to the serving GW only.

S708: The serving GW returns an Update Bearer Response message to theMME.

S719: The MME sends an HO Complete message to the HRPD AN to notify theHRPD AN of the completion of the handover.

S720: The PDN GW initiates a release process at the source HRPD network.

The process of handover from an E-UTRAN to an HRPD network through abi-casting method is also described in the third embodiment of thepresent invention. Herein, the receiving network is an HRPD network; theoriginating network is an E-UTRAN; the first NE of the receiving networkis an HRPD AN; the second NE of the receiving network is a PDSN; and theuser plane anchor point NE is a PDN GW. As shown in FIG. 8A, the processincludes the following steps:

S8A01: After discovering that the UE is handed over from the E-UTRAN tothe HRPD network, the HRPD AN sends a message to notify the PDN GW ofbi-binding.

S8A02: The PDN GW is bound with the serving GW and the PDSN.

S8A03: After receiving downlink data, the PDN GW bi-casts the downlinkdata to the serving GW and PDSN.

S8A04: After the UE is handed over to the HRPD network, the HRPD ANnotifies the PDN GW of canceling the bi-binding.

S8A05: After receiving the downlink data, the PDN GW sends the receiveddownlink data to the serving GW only.

The handover signaling process associated with the preceding process inthe network scenario is shown in FIG. 8B, and includes the followingsteps:

S801: The UE accesses the E-UTRAN.

S802: The UE or the eNodeB determines to register with the HRPD network.

S803: The UE executes a particular program in the HRPD AN to establishan IP service connection with the PDSN and perform authentication in theHRPD AN.

S804: The UE or the eNodeB determines to perform handover from theE-UTRAN to the HRPD network.

S805: The eNodeB sends a Relocation Indication message to the UE tonotify the UE of handover.

S806: The UE sends an HRPD Connection Request message to the HRPD AN.The HRPD AN allocates radio resources, and activates the PDSN session.

S807: The HRPD AN sends an A11-Registration Request message to the PDSN.The HRPD AN adds an indication information element to this message tonotify the PDSN of the cause of this registration request or how toprocess this registration request. The indication information elementmay include:

E-UTRAN to HRPD handover indication or 3GPP to non-3GPP handoverindication.

Handover type: The HRPD AN sets this information element to “E-UTRAN toHRPD Handover” or “3GPP to non-3GPP Handover”.

Cause: The HRPD AN sets this information element to “E-UTRAN to HRPDHandover” or “3GPP to non-3GPP Handover”.

Bi-casting indication: The HRPD AN notifies subsequent NEs of the needto perform bi-casting through this information element.

The HRPD AN sets the “S” flag bit of the Flag information element in theA11-Registration Request message to “True” or “1” to notify the PDSNthat this registration request is caused by PDSN fast handoff.

S808: After receiving the A11-Registration Request message, the PDSNsends a Proxy BU message to the PDN GW if the PDSN discovers that thisregistration request is caused by handover or that the subsequent NEsneed to perform bi-casting. The PDSN may add an indication informationelement to this message to notify the PDN GW of the cause of this BUmessage or how to process this BU message. The indication informationelement may include:

E-UTRAN to HRPD handover indication or 3GPP to non-3GPP handoverindication.

Handover type: The PDSN sets this information element to “E-UTRAN toHRPD Handover” or “3GPP to non-3GPP Handover”.

Cause: The PDSN sets this information element to “E-UTRAN to HRPDHandover” or “3GPP to non-3GPP Handover”.

Bi-casting indication: The PDSN notifies subsequent NEs of the need toperform bi-casting through this information element.

The PDSN sets the “S” flag bit in the Proxy BU message to notify the PDNGW of bi-binding.

After receiving the preceding notification, the PDN GW adds a BU, andretains resources in the source E-UTRAN. After receiving downlink data,the PDN GW bi-casts the downlink data in the source E-UTRAN and targetHRPD network. The PDN GW may start a timer, cancel the bi-castingmechanism and release resources in the source E-UTRAN after the timertimes out.

S809: The PDSN returns an A11-Registration Reply message to the HRPD AN.

S810: The HRPD AN sends an S101 HO Command message (HRPD TCA) to theMME.

S811: The MME sends an S1-AP message “Relocation Command” (HRPD TCA) tothe eNodeB.

S812: After receiving this message, the eNodeB sends an HO Commandmessage to the UE to notify the UE of handover, where the HO Commandmessage carries an HRPD TCA message.

S813: The UE is handed over to the HRPD AN and executes a trafficchannel acquisition program.

S814: The UE sends an HRPD Traffic Channel Complete (TCC) message to theHRPD AN.

S815: The HRPD AN sends an A11-Registration Request message to the PDSN.The HRPD AN adds an indication information element to this registrationrequest message to notify the PDSN that this registration request iscaused by the handover of the UE to the target network and the PDSNneeds to notify the PDN GW of updating the downlink data route. Theindication information element may include:

Handover complete indication.

Handover type: The HRPD AN sets this information element to “HandoverComplete”.

Update type: The HRPD AN sets this information element to “User PlanePath Switch” or “Cancel Bi-casting”.

Cause: The HRPD AN sets this information element to “Handover Complete”,“User Plane Path Switch” or “Cancel Bi-casting”.

Cancel bi-casting indication: The HRPD AN notifies subsequent NEs ofcanceling bi-casting through this information element.

The HRPD AN sets the “S” flag bit of the Flag information element in theA11-Registration Request to “False” or “0”.

Through the preceding indication information element, the HRPD ANnotifies the PDSN UE of successful handover to the target network or theneed to switch the user plane path. This flag bit is optional.

S816: After receiving the A11-Registration Request message, the PDSNsends a Proxy BU message to the PDN GW if the PDSN discovers that thisregistration request is caused by the handover of the UE to the HRPDnetwork or discovers that the user plane path needs to be switched. ThePDSN may add an indication information element to this registrationrequest message to notify the PDN GW of the cause of this BU message orhow to process this BU message. The indication information element mayinclude:

Handover complete indication.

Handover type: The PDSN sets this information element to “HandoverComplete”.

Update type: The PDSN sets this information element to “User Plane PathSwitch” or “Cancel Bi-casting”.

Cause: The PDSN sets this information element to “Handover Complete”,“User Plane Path Switch” or “Cancel Bi-casting”.

Cancel bi-casting indication: The PDSN notifies subsequent NEs ofcanceling bi-casting through this information element.

The PDSN clears the “S” flag bit in the Proxy BU message to notify thePDN GW of canceling the bi-binding (that is, canceling the binding inthe source network).

Through the preceding indication information element, the PDSN notifiesthe PDSN GW that the UE is handed over to the target network or the needto switch the user plane path or to cancel the bi-casting. This flag bitis optional.

After receiving the preceding message, the PDN GW cancels the databi-casting mechanism and routes the downlink data to the PDSN. Afterreceiving the downlink data, the PDN GW sends the received downlink datato the PDSN only.

S817: The PDSN returns an A11-Registration Reply message to the HRPD AN.

S818: The source E-UTRAN or EPS releases resources.

Embodiments of the present invention provide a lossless data processingmethod in the case of handover between heterogeneous networks. Thismethod overcomes the problem of data loss during the handover betweenheterogeneous networks in the existing technology by using a dataforwarding method or a bi-casting method, reduces the duration of userservice interruption and enhances the user experience.

A data processing system is provided in the fourth embodiment of thepresent invention, used for forwarding data in the case of handoverbetween heterogeneous networks. As shown in FIG. 9, the data processingsystem includes a data processing device 10 of a receiving network and adata processing device 20 of an originating network. The data processingdevice 10 of the receiving network is adapted to create a dataforwarding address, and receive data from the data processing device 20of an originating network.

The data processing device 10 of the receiving network further includes:

a handover originating entity 11, adapted to: notify a gateway of thelocal network of creating a data forwarding address when detecting thata UE in an originating network is handed over to the local network, andsend the data forwarding address to the originating network, where: whenthe local network is an HRPD network, the handover originating entity 11is located in an HRPD AN; when the local network is an E-UTRAN, thehandover originating entity 11 is located in an MME; and

a gateway 12 of the receiving network, adapted to: create a dataforwarding address when receiving the notification message from thehandover originating entity 11, notify the handover originating entity11 of the data forwarding address, and receive data from the originatingnetwork.

The data processing device 20 of the originating network furtherincludes:

a handover processing entity 21, adapted to: obtain a data forwardingaddress created in the receiving network when the UE in the localnetwork is handed over to the receiving network, and send the dataforwarding address to a gateway 22 of the originating network, where:when the local network is an HRPD network, the handover processingentity 21 is located in the HRPD AN; when the local network is anE-UTRAN, the handover processing entity 21 is located in the MME; and

the gateway 22 of the originating network, adapted to: create a dataforwarding tunnel between the gateway 22 of the originating network andthe gateway 12 of the receiving network according to the data forwardingaddress from the handover processing entity 21, and send data to thereceiving network through the data forwarding tunnel.

A data processing system is provided in the fifth embodiment of thepresent invention, used for forwarding data in the case of handoverbetween heterogeneous networks. As shown in FIG. 10, the data processingsystem includes:

a data processing device 40 of a receiving network, adapted to: notify auser plane anchor point NE 50 of bi-casting when detecting that a UE ishanded over from an originating network to the local network, andreceive data from the user plane anchor point NE 50; and

the user plane anchor point NE 50, adapted to: perform bi-casting in thereceiving network and the originating network according to thenotification from the receiving network, and send data to the receivingnetwork and the originating network.

The data processing device 40 of the receiving network further includes:

a handover originating entity 41, adapted to notify a gateway 42 of thelocal network when detecting that the UE in the originating network ishanded over to the local network, where: when the local network is anHRPD network, the handover originating entity is located in an HRPD AN;when the local network is an E-UTRAN, the handover originating entity 11is located in an MME; and

the gateway 42 of the receiving network, adapted to: notify the userplane anchor point NE 50 of the receiving network and the originatingnetwork when receiving the notification from the handover originatingentity 41; and receive data that the user plane anchor point NE 50 sendsto the originating network and the receiving network.

Through the system and device provided in preceding embodiments of thepresent invention, a lossless data processing method is provided in thecase of handover between heterogeneous networks. This method overcomesthe problem of data loss during the handover between heterogeneousnetworks in the existing technology by using a data forwarding method ora bi-casting method, reduces the duration of user service interruptionand enhances the user experience.

Through the preceding description of embodiments of the presentinvention, it is understandable to those skilled in the art thatembodiments of the present invention may be implemented by hardware orby software in combination with a necessary hardware platform. Thus, thetechnical solution of the present invention may be made into software.The software may be stored in a non-volatile storage medium (forexample, a CD-ROM, a USB disk, and a mobile hard disk), and includeseveral instructions that instruct a computer device (a personalcomputer, a server, or a network device) to perform the methods providedin each embodiment of the present invention.

Although the present invention has been described through severalexemplary embodiments, the invention is not limited to such embodiments.It is apparent that those skilled in the art can make variousmodifications and variations to the invention without departing from thespirit and scope of the invention. The invention is intended to coverthe modifications and variations provided that they fall in the scope ofprotection defined by the following claims or their equivalents.

What is claimed is:
 1. A data processing method, comprising: when a userequipment (UE) is handed over from an originating network to a receivingnetwork, receiving, by the originating network, a data forwardingaddress obtained by the receiving network; creating a data forwardingtunnel between an originating network gateway and a receiving networkgateway according to the data forwarding address; and forwarding data tothe receiving network through the data forwarding tunnel, wherein whenthe receiving network is a high rate packet data (HRPD) network and theoriginating network is an evolved UMTS terrestrial radio access network(E-UTRAN), the method further comprises: obtaining, by an HRPD accessnetwork (HRPD AN) of the HRPD network, the data forwarding address froma gateway packet data serving node (PDSN) of the HRPD network; and theprocess of receiving, by the originating network, the data forwardingaddress obtained by the receiving network comprises receiving, by amobility management entity (MME) of the E-UTRAN, the data forwardingaddress from the HRPD AN.
 2. The data processing method of claim 1,wherein the process of creating the data forwarding tunnel between theoriginating network gateway and the receiving network gateway accordingto the data forwarding address comprises: sending, by the MME, the dataforwarding address to a serving gateway (S-GW) of the E-UTRAN to notifythe S-GW of establishing a data forwarding tunnel; establishing, by theS-GW, a data forwarding tunnel between the PDSN and the S-GW accordingto the data forwarding address, and establishing, by the S-GW, a dataforwarding tunnel between an evolved NodeB (eNodeB) on the E-UTRAN andthe S-GW.
 3. The data processing method of claim 2, wherein the processof forwarding data to the receiving network comprises: receiving, by theS-GW, packets that the eNodeB sends through the data forwarding tunnel,and sending the received packets to the PDSN through the data forwardingtunnel between the PDSN and the S-GW.
 4. The data processing method ofclaim 2, wherein the process of notifying the S-GW of establishing adata forwarding tunnel comprises: sending, by the MME, a Create BearerRequest message to the S-GW, which includes an indication informationelement to indicate the S-GW of establishing the data forwarding tunnel.5. The data processing method of claim 2, wherein the process ofnotifying the S-GW of establishing a data forwarding tunnel comprises:sending, by the MME, a Create Data Forwarding Tunnel Request to theS-GW, to notify the S-GW of establishing the data forwarding tunnel. 6.The data processing method of claim 1, wherein the process of obtainingthe data forwarding address from the PDSN of the HRPD network by theHRPD AN comprises: notifying, by the HRPD AN, the PDSN of establishingthe data forwarding tunnel; and notifying, by the PDSN, the HRPD AN ofthe data forwarding address of the data forwarding tunnel.
 7. The dataprocessing method of claim 2, wherein after the S-GW establishes thedata forwarding tunnel between the PDSN and the S-GW and the dataforwarding tunnel between the eNodeB and the S-GW, the method furthercomprises: by the S-GW, starting a timer, and releasing the establisheddata forwarding tunnel after the timer expires.
 8. A data processingmethod, comprising: when a user equipment (UE) is handed over from anoriginating network to a receiving network, receiving, by theoriginating network, a data forwarding address obtained by the receivingnetwork; creating a data forwarding tunnel between an originatingnetwork gateway and a receiving network gateway according to the dataforwarding address; and forwarding data to the receiving network throughthe data forwarding tunnel, wherein when the receiving network is anevolved UMTS terrestrial radio access network (E-UTRAN) and theoriginating network is a high rate packet data (HRPD) network, themethod further comprises: obtaining, by a mobility management entity(MME) of the receiving network, the data forwarding address from aserving gateway (S-GW) of the receiving network; and the process ofreceiving, by the originating network, the data forwarding addressobtained by the receiving network comprises receiving, by an HRPD accessnetwork (HRPD AN) of the originating network, the data forwardingaddress from the MME.
 9. The data processing method of claim 8, whereinthe process of creating the data forwarding tunnel between theoriginating network gateway and the receiving network gateway accordingto the data forwarding address comprises: sending, by the HRPD AN, thedata forwarding address to a gateway packet data serving node (PDSN) ofthe HRPD network, and notifying the PDSN of establishing a dataforwarding tunnel; and establishing, by the PDSN, a data forwardingtunnel between the PDSN and the S-GW according to the data forwardingaddress.
 10. The data processing method of claim 9, wherein the processof notifying the PDSN of establishing a data forwarding tunnelcomprises: sending, by the HRPD AN, an A11-Registration Request messageto the PDSN, which includes an indication information element toindicate the PDSN of establishing the data forwarding tunnel.
 11. Thedata processing method of claim 8, wherein the process of forwardingdata to the receiving network comprises: forwarding, by the PDSN,received packets to the S-GW through the data forwarding tunnel betweenthe PDSN and the S-GW; caching, by the S-GW, the received packets. 12.The data processing method of claim 8, wherein the process of forwardingdata to the receiving network comprises: forwarding, by the PDSN,received packets to the S-GW through the data forwarding tunnel betweenthe PDSN and the S-GW; forwarding, by the S-GW, the received packets toan eNodeB through the data forwarding tunnel between the S-GW and theeNodeB.
 13. A data processing system of a receiving network thatimplements a handover process from an originating network, comprising: ahandover originating entity to notify a gateway of the receiving networkof creating data forwarding resources when detecting that a userequipment (UE) is handed over to the receiving network, receive a dataforwarding address sent from the gateway of the receiving network, andsend the data forwarding address to the originating network for creationof a data forwarding tunnel between the gateway of the receiving networkand a gateway of the originating network gateway according to the dataforwarding address, thereby data forwarded data to the receiving networkthrough the data forwarding tunnel; and the gateway of the receivingnetwork to receive the notification from the handover originatingentity, create data forwarding resources, and send the data forwardingaddress to the handover originating entity, wherein when the receivingnetwork is a high rate packet data (HRPD) network and the originatingnetwork is an evolved UMTS terrestrial radio access network (E-UTRAN),the system further comprises: an HRPD access network (HRPD AN) of theHRPD network to obtain the data forwarding address from a gateway packetdata serving node (PDSN) of the HRPD network, thereby receipt, by theoriginating network, of the data forwarding address obtained by thereceiving network comprises receiving, by a mobility management entity(MME) of the E-UTRAN, the data forwarding address from the HRPD AN; orwherein when the receiving network is an evolved UMTS terrestrial radioaccess network (E-UTRAN) and the originating network is a high ratepacket data (HRPD) network, the system further comprises: a mobilitymanagement entity (MME) of the receiving network to obtain the dataforwarding address from a serving gateway (S-GW) of the receivingnetwork, thereby receipt, by the originating network, of the dataforwarding address obtained by the receiving network comprisesreceiving, by an HRPD access network (HRPD AN) of the originatingnetwork, the data forwarding address from the MME.